T io ist



@einen ltetes Beirut @frn IMPROVEMENT IN STEAM GENBRATOBS.

D. B. TAN GElt, OF BELLEFON TAIN E, OHIO.

Letters Patent No. 60,279, dated December 4, 1866.

SIIPECIIIIIIIC'JVAJIIOJN'. To ALL WHoM IT MAY ooNoERN:

Beit known that I, D. B. TANGER, of Bellefontaine, in the county of Logan, and State ofA Ohio, have invented a new and useful improvement in Steam Boilers; and I do hereby declare that the following is a full,

clear, and exact description thereof, which will enable others skilled in the art to make and use thesame,

reference being had to the accompanying drawings, forming part of this specication, in which- Figure 1 represents a longitudinal vertical section of this invention.

Figure 2 is a similar section of the same, looking in a direction opposite toA that from the previous figure.

Figure 3 isan inverted plan of the same.

Similar letters of reference indicate like parts.

This invention consists in the combination and arrangement4 of certain pipes with the {ire-box and boiler, whereby steam is generated in a manner as will be hereinafter more .fully described.

A represents the body of my steam boiler, from whichwrises the dome B, which is provided with a cap, C from which emanates the steam-pipe leading to the engine, or other place Where the steam is to be used. The

body ofthe boiler is made in the form of an ordinary locomotive boiler, and it is provided with a fire-box, D,/te.

which access is had through a suitable fire-door in the ordinary manner. E is la pipe, which extends through the top or side of the boiler, and communicates with a serpentine pipe, F, situated below the crown sheet of the fire-box, and near tothe same, and from said serpentine pipe extends a pipe, Gr, down in the space between the outside of the hre-boxV and the inside of the boiler, as clearlyshown in figs; 1 and 2 of the drawing. This pipe connects with a pipe, H, which surrounds the bottom of the re-box, and which is provided with a series of nipples, a, extending downward, as shown. Through the pipe lhA I inject air or gas, which, while passing `through the serpentine pipe F, is highly heated, and, after descending through the pipe G, discharges through the nipples of the pipe H, thus imparting its heat to the water in the space surrounding the Afire-box, and producing a circulation of said water in the boiler. A suitable check-valve in the pipe Eprevents the air or gas from returning after the same has been once forced in the boiler. Said air or gas is forced in by a suitable pump, and if the pump is not in operation, a connection, p, between the pipe E and the steam space is provided, so as to produce an equilibrium in the pipe, and allow the-water to rise in the same and save the pipe being burned. I is a second pipe, which also serves to inject air into the boiler. This pipe enters `the boiler either from the front-or fr om the side, and it connects with a serpentine pipe, J, that occupies three sides of the fire-box (see iig. 3), being situated close to said sides, so as not to interfere with the ordinary draught and ei'fect of the lire. From said serpentine pipe extends a pipe, K, along the bottom of the boiler, returning again to the serpentine pipe if desired. The pipe K is provided with a series of nipples, c, similar to the nipples a of the pipeH, so that air or gas injected-in the pipe I` will be highly heated while passingothrough the serpentine pipe 4J, and it is then discharged through the nipples k, at the bottom of the boiler. The heated air or gas is thus brought in intimate contact with the water in the boiler, and, by parting with a portion of its heat, promotes the evaporation of the water'and the formation of steam. At the same time, if the air or 'gas is heated to a very high temperature, the heat still retained by the same, after having passed the water, serves to superheat the steam generated in the boiler. A suitable `check-valve, l, in the pipe I prevents the airY or gas contained therein from returning after it has once been forced in. By this arrangement steam can be generated with a comparatively small quantity of fuel, and the danger of an explosion is materially reduced.

What I claim as new, and desire to secure by Letters Patent is- 1. The pipes E F II, in combination with the fire-box D and boiler A, constructed and operating substantially as and for the purpose described.

2. The pipes II J K, in combination with the tire-box D and boiler A, constructed and operating'substam tially as and for the purpose set forth.A

The above specication of my invention, signed by me this day of p 1866.

D. B. TANGER.

Witnesses:

W. H. H. Woon, W. L. RoBUcK. 

